2.1.55 [HTML5] Section 4.8.3 Downloading resources

V0130: The download attribute is not supported

The specification states:

 4.8.3 Downloading resources
     In some cases, resources are intended for later use rather than immediate viewing. To 
     indicate that a resource is intended to be downloaded for use later, rather than 
     immediately used, the download attribute can be specified on the a or area element 
     that creates the hyperlink to that resource.

IE11 Mode, IE10 Mode, IE9 Mode, IE8 Mode, IE7 Mode, and IE5 (Quirks) Mode (All versions)

The download attribute is not supported.